4PJ3

Structural insight into the function and evolution of the spliceosomal helicase Aquarius, Structure of Aquarius in complex with AMPPNP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

The RNA helicase Aquarius exhibits structural adaptations mediating its recruitment to spliceosomes.

De, I.Bessonov, S.Hofele, R.Dos Santos, K.Will, C.L.Urlaub, H.Luhrmann, R.Pena, V.

(2015) Nat.Struct.Mol.Biol. 22: 138-144

  • DOI: 10.1038/nsmb.2951

  • PubMed Abstract: 
  • Aquarius is a multifunctional putative RNA helicase that binds precursor-mRNA introns at a defined position. Here we report the crystal structure of human Aquarius, revealing a central RNA helicase core and several unique accessory domains, including ...

    Aquarius is a multifunctional putative RNA helicase that binds precursor-mRNA introns at a defined position. Here we report the crystal structure of human Aquarius, revealing a central RNA helicase core and several unique accessory domains, including an ARM-repeat domain. We show that Aquarius is integrated into spliceosomes as part of a pentameric intron-binding complex (IBC) that, together with the ARM domain, cross-links to U2 snRNP proteins within activated spliceosomes; this suggests that the latter aid in positioning Aquarius on the intron. Aquarius's ARM domain is essential for IBC formation, thus indicating that it has a key protein-protein-scaffolding role. Finally, we provide evidence that Aquarius is required for efficient precursor-mRNA splicing in vitro. Our findings highlight the remarkable structural adaptations of a helicase to achieve position-specific recruitment to a ribonucleoprotein complex and reveal a new building block of the human spliceosome.


    Organizational Affiliation

    Macromolecular Crystallography, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Intron-binding protein aquarius
A
1475Homo sapiensMutation(s): 0 
Gene Names: AQR (KIAA0560)
EC: 3.6.4.13
Find proteins for O60306 (Homo sapiens)
Go to Gene View: AQR
Go to UniProtKB:  O60306
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ANP
Query on ANP

Download SDF File 
Download CCD File 
A
PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER
C10 H17 N6 O12 P3
PVKSNHVPLWYQGJ-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.191 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 94.986α = 90.00
b = 140.444β = 90.00
c = 144.761γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
Cootmodel building
PHENIXrefinement
PDB_EXTRACTdata extraction
SHELXDphasing
SHELXphasing
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-01-21
    Type: Initial release
  • Version 1.1: 2015-02-11
    Type: Database references
  • Version 1.2: 2015-02-25
    Type: Database references
  • Version 1.3: 2016-06-01
    Type: Data collection
  • Version 1.4: 2017-11-22
    Type: Advisory, Derived calculations, Refinement description